DISEASE CHARACTERISTICS: Histologically proven intestinal (esophagus, stomach, small intestine, or colon) graft-versus-host disease (GVHD) exhibiting symptoms such as nausea, vomiting, anorexia, diarrhea, or abdominal pain in the absence of another explanation for these symptoms Specific contraindications to high-dose immunosuppressive therapy, such as: Recurrent malignant disorder for which an allogeneic antitumor effect is desired Aspergillus or other fungal infection Severe myopathy, hyperglycemia, bone problems, or neuropsychiatric symptoms related to corticosteroid use Thrombotic thrombocytopenic purpura or hemolytic uremic syndrome related to immunosuppressive therapy Epstein-Barr virus-related immunoproliferative disease No GVHD unresponsive to prior high-dose immunosuppressive therapy No concurrent infections involving the intestinal tract such as: Salmonella Shigella Clostridium difficile (toxin positive) Rotavirus Giardia lamblia Cytomegalovirus by shell vial culture